Lake St. Clair, Michigan, photo by StormyRed_28

Lakestclair.net’s page on the South Channel Lights off Harsens Island says:

Lake St. Clair has two lighthouse structures built before Abraham Lincoln was President of the United States. They still stand today just off the southeastern tip of Harsens Island.Construction of the Old South Channel Range Lights started in 1855 and finished in 1859. These lights guided ships into the fresh water delta once known as the Venice of America.

Save Our South Channel Lights is trying to save this endangered pair of lighthouses (also see this article in the Freep about them). There’s a map to their location from Lighthouse Friends.